Andy Grove created ARROW-4596:
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Summary: [Rust] [DataFusion] Implement COUNT aggregate function
Key: ARROW-4596
URL: https://issues.apache.org/jira/browse/ARROW-4596
Project: Apache Arrow
Issue Type: Improvement
Reporter: Andy Grove
Fix For: 0.13.0
Add support for COUNT aggregate function. See SUM function in aggregates.rs for
inspiration.
SQL parser should support COUNT(1) and COUNT(*) syntax for counting rows as
well as COUNT(column_name) for counting non-null values for a column.
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